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Colorize Tabs is a browser extension that colors
tabs to match a website’s theme-color.

Firefox - https://addons.mozilla.org/en-US/firefox/addon/colorize-tabs/
theme-color?Since Chrome
39 shipped with Android Lollipop in 2014 websites can use
theme-color to customize the browser toolbar. Simply drop
this tag in the head of a webpage!
<meta name="theme-color" content="#db5945">Today many websites support theme-color and Chrome for
Android looks 🔥🔥🔥

Unfortunately theme-color still remains unsupported on
the desktop - just light gray with favicons.
Currently Firefox is the only browser with theme API support. link Hopefully other browsers will provide these APIs in future releases!